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ZCS 5.0.7 consumes more CPU cycle for the JAVA , Amavisd ..

We are using 3.8Gb Ram , ZCS RHEL5 - 5.0.7 version , Intel(R) Xeon(R) CPU 5150 @ 2.66GHz .
Please suggest us , how can we reduce the CPU cycles for Java process ...
can we increase the HEAP size of JVM ??